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Those things break so easily man, that's not surprising at all. I actually destroyed the forward end of the one on my last truck, you can ask crvtec, it's sitting in his back yard lol. You can actually just replace that one part, just gotta make sure the new one has the same clearance as the old one. Otherwise it will score your camshaft.

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More than likely the timing belt broke in the past causing the piston to hit the valve. Doesn't always break the rockers depending on the cam position at the time. The crack was small at first and grew. I've never seen someone break one from tightening myself.